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Questions tagged [blood-pressure]

the pressure of circulating blood on the walls of blood vessels. When used without further specification, "blood pressure" usually refers to the pressure in large arteries of the systemic circulation. Use this tag in questions related to measurement and study about blood pressure and diseases which involve high/low/irregular blood pressure.

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15 views

Blood levels of cholesterol necessary for reversal of artherosclerosis?

It is claimed based on autopsies of starved humans/animals and cholesterol and dietary restriction studies in animals that atherosclerosis if cholesterol can be reversed to a degree, rather than just ...
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Vasoconstriction and blood flow

The resistance in a blood vessel is equal to the pressure difference divided by the blood flow. Let us now say that a sympathomimetic causes vasoconstriction which increases the resistance. Does this ...
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increase in blood pressure can in turn decrease it?

increase in blood pressure can actually decrease it? bp=co*TP and cardiac output (co) decreases when after load increases, because with the increase of the after load, stroke volume decreases. ...
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1answer
100 views

Cardiac cycle and atrial contraction

During atrial contraction ("a" in the figure), why does the ventricular pressure match the atrial pressure? The ventricular pressure generally stays the same throughout passive filling until it ...
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In oscillometric blood pressure measurement, why do we assume that highest oscillations correspond with mean arterial pressure?

As far as I've seen, the point on the oscillometric curve where there are greatest oscillations represents the mean arterial pressure (MAP). My question is - why? What is the logic behind this ...
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20 views

How does a stronger heart reduce the risk of CVD?

I read from websites and articles that exercise will make your heart stronger thus your heart will use less effort to pump blood around the body per heartbeat thus reduce risk of CVD. However, how ...
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34 views

Cardiopulmonary reflex

Cardiopulmonary receptors (CPR) locate in the junction of great veins (IVC/SVC/PV) to atria. They are also known as low-pressure receptors. They detect the increase of preload to atria. Statement 1: ...
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49 views

Will being very muscular (to the point that one is characterised as obese by BMI) increase blood pressure?

It is widely accepted that obesity/overweight (which I believe refers to people with a high amount of fat cells instead of bodybuilders who weigh a lot due to lots of muscle cells) have higher blood ...
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1answer
56 views

Blood pressure in the blood vessels

Why do the capillaries have a lower blood pressure than the arteries even though the capillaries lumen is much narrower. Wouldn't the narrowness of the blood vessel increase the pressure? Also the ...
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114 views

How increased potassium intake increases sodium excretion?

"K+ antagonises the biological effects of Na+". I have been reading the same many times without any explanation. How actually (mechanism) K+ helps excretion of Na+?, their interactions? And eventually ...
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119 views

What could an increase in systolic blood pressure and decrease in diastolic mean?

Sorry if this is a really simple question but my academic background is in completely different sciences. I recently made a computer game for an experiment that was related to anxiety and relaxation. ...
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3k views

Osmotic Pressure in Capillaries [closed]

In this diagram, D is apparently the point at which "the osmotic pressure into the capillaries is the greatest", but I cannot figure out why. Any help would be much appreciated!
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Physiological Effect of Mannitol

Which Starling Force is affected by Mannitol? I am either thinking hydrostatic pressure of interstitial fluid (because it increases interstitial fluid volume) or hydrostatic pressure of capillary (...
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92 views

How can potassium rich foods reduce blood pressure?

How come sodium increases blood pressure, but potassium, which has to some extent similar properties helps lower it?
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191 views

Is a one ventricle heart feasible?

So this is derived from a lesson at Khan Academy. The mind activity assumes that the one ventricle heart pumps blood to the lungs for oxygenation then rest of the body. However, the problem is that ...
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1answer
572 views

High Blood Pressure - Na or NaCl? [closed]

What is the cause of high blood pressure? or, Which foods can cause high blood pressure? Is it just sodium, or sodium chloride? I'm confused because sodium chloride should ionise in the aqueous ...
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28k views

Exsanguination Time from Damage to Major Arteries

For a game project, I need to study how much blood loss is suffered when the major arteries of the human body are severed. I believe there are medical textbooks that have collected data on blood ...
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607 views

Why do people perceive blood pressure as the force that moves the blood forwards (see details)?

For example "Veins contain a lot of valves because the blood pressure inside them is low.". This wouldn't make any sense unless if blood pressure was perceived as the force that drives the blood ...
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294 views

How are limits determined for systotic and diastotic blood pressure?

I know that the upper limits for systotic/diastotic blood pressure are 120/80. What is the mathematics behind these numbers? I am curious because I did not find information regarding how the numbers ...
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Does capillary blood pressure have any effect on how much oxygen or nutrient gets distributed to tissues?

From what I have read regarding blood pressure and blood flow, I've come to the conclusion that, apart from the osmolarity of blood, the only determinant of how much oxygen/nutrients the tissues get ...
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How does sodium ion increase blood pressure?

So I have been reading about the RAAS system and I was wondering how natrium (sodium ) ions increase blood pressure.I have been looking up on the internet and have yet to find an answer.Help
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1answer
296 views

Why is it always Sodium that we talk of in blood pressure?

Why is that we emphasize so much on sodium in blood pressure? I understand that it is a major extracellular ion, but, it also is tightly regulated. So when something is that tightly regulated, won't ...
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How does the mechanism which controls blood pressure in the brain work?

I know that pressure is sensed in the skin by mechanoreception mediated by skin receptors. Static pressure stimuli are mainly sensed by slow-adapting fibers connected to receptors like the Merkel ...
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1answer
15k views

What is the normal blood water content

What is the normal water volume per 1 L of blood, and how much deviation from that norm causes dehydration or hyponatremia?
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Is lowered blood pressure a primary lethal symptom of an opiate overdose?

When someone has a opiate overdose, they can have no or almost no pulse and can have shallow breathing or stop breathing. When you stop breathing (for example) by drowning, you can survive for a long ...
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320 views

Saturation vapor pressure effect on human body [closed]

I found this calculator: http://www.decatur.de/javascript/dew/ It calculates the dew point based on temperature and humidity. In the result it is mentioned the saturation vapor pressure. I barely ...
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Why do changes in preload not cause changes in end systolic pressure?

I am trying to understand why changes in preload do not cause concomitant changes in end systolic pressure. If you have preload enhancement than this should lead to an increase in cardiac output.....
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283 views

Blood pressure measurement

When measuring your blood pressure in your arm, when you hear the sound to measure the systolic, is that sound NOT the heartbeat?
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4k views

How does pressure measured by sphygmomanometer translate directly to blood pressure?

As per my understanding a sphygmomanometer when wrapped around the arm and inflated only measures the pressure of the air inside the cuff, doesn't it? How does that translate directly to the pressure ...
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1answer
453 views

Difference between pulse and blood pressure

I'm a very naive and biologically illiterate person, and from what I've read on the internet I'm not really sure I understand the difference between pulse and ...
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1answer
27k views

Arm at Heart Level when Measuring Blood Pressure

How come that one's arm has to be at heart level so that the blood pressure can be measured accurately. I've tried researching this question, but most answers to it were just "if the arm is above the ...
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1k views

What creates the feeling of 'excess' blood pressure to an area of the body?

If I hang upside down, and feel blood rushing to my head, what structures are actually responsible for me "feeling" this excess flow of blood? Baroreceptors? Mechanoreceptors? Something else? ...
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1answer
3k views

How can heart disease cause dizziness after eating?

I have been reading several articles explaining dizziness after eating (see here and here), and both articles gloss over something that I found pretty remarkable. Both articles claim that "heart ...
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118 views

Is the molecule nitric oxide responsible for healing blood vessels?

Is the molecule nitric oxide responsible for healing blood vessels? How does nitric oxide heal the blood vessels? I watched a documentary about the healing effects of nitric oxide. In the video I saw ...
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1answer
173 views

Why can blood vessel contraction be described as a second order system?

Suppose that the x-axis represents time, and the y-axis vessel diameter. Then this graph is claimed to roughly describe what happens when the blood pressure increases, then decreases. When the ...
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1answer
77 views

Specialist evaluation for people aged under 40 years with stage 1 hypertension

Reading the NICE clinical guideline for Hypertension it says... For people aged under 40 years with stage 1 hypertension and no evidence of target organ damage, cardiovascular disease, renal ...
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1answer
611 views

Why does weight loss lower blood pressure?

I have read that weight loss is an effective lifestyle modification for people with hypertension, and systolic pressure may be reduced by up to 1-2 mmHg for every 1kg of weight lost. What is the ...
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1answer
18 views

What studies are there showing the effectiveness of any substance on canine hypertension?

Searching on http://www.ncbi.nlm.nih.gov I could only find the article titled as "Telmisartan Treatment of Refractory Proteinuria in a Dog".
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Thrombus and Embolii

Can treatment of thrombus cause embolism, in case of very high blood pressure, that may even lead to a heart attack ? As the very high Blood pressure may cause some of the enzymes not act completely ...
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1answer
424 views

People say the cardiac cycle depends on blood pressure? How so?

I know what the cardiac cycle is. There are two phases diastole and systole. One is the relaxed, and the other is the contracted form of the heart. The diastole is where blood is pumped to the ...
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1answer
615 views

What is the blood ejection speed outward from human body vein? [closed]

At what height blood can eject from human vein ? I see, sometime there is direct blood transfer from one person to patient. So sometime blood bottle is kept at certain height and blood is transfered ...
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105 views

How do cellphones calculate heart rate?

How do cellphones calculate heart rate ? I understand that the cameras there try to count undulation in blood flow, but is the method of calculation same as that of professional SpO2 monitors ?
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1answer
1k views

Can too low oncotic pressure lead to Third spacing and Edema?

I know that low oncotic pressure is associated with many pathologies. I am interested how it is associated with Third spacing. My professor says that it can permit edema formation. The opposing ...
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1answer
74k views

Blood Pressure: Significance of difference between systolic and diastolic

I wanted to understand what is the difference between systolic and diastolic readings of blood pressure. I understand 120-80 to about 100-60 is considered normal but does the difference in the two ...
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1answer
104k views

Blood pressure difference while seated and laid down [closed]

My blood pressure readings differ a lot when I read them while seated and while I lay down on a bed. I tie the strap in both cases to my left bicep and rest for a minute before noting the readings ...
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1answer
42k views

How are the paranasal sinuses linked with the capillaries in the ear canals?

Sinus congestion often seems to be accompanied by excess pressure on the outer ears (as anyone who has shared a transcontinental flight with an infant can attest to) or fluid buildup in the canals. ...
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2answers
304 views

Blood circulation and blood pressure in different tissues [closed]

The volume of blood coursing the blood circulation is approximately five litres. A typical vein will stretch about eight times as much as corresponding artery. Because veins have high capacitance, ...